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Title: Total experimental uncertainty in hydrodynamic testing of a semisubmersible wind turbine, considering numerical propagation of systematic uncertainty

Abstract

Quantifying the uncertainty in experimental results is a vital step in properly validating numerical simulation tools for designing floating wind turbines; without a good understanding of the experimental uncertainties, it is impossible to confirm if numerical simulation tools can capture the physics with acceptable accuracy. Recent validation studies suggest that the wave-induced, low-frequency surge and pitch motions of semisubmersible-type floating wind turbines are consistently underpredicted by numerical simulations, but it has not been possible to state whether or not this underprediction is within the level of experimental error. Here, previously assessed systematic uncertainty components in hydrodynamic tests of the OC5-DeepCwind semisubmersible are propagated to response metrics of interest using numerical simulation tools, and combined with the system's random uncertainty to obtain the total experimental uncertainty. The uncertainty in the low-frequency response metrics is found to be most sensitive to the system properties (e.g., mooring stiffness and center of gravity), and also the wave elevation. The results of the present study suggest that the underprediction of the low-frequency response behavior observed in previous validation studies is larger than the experimental uncertainty.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [1];  [4]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Norwegian Univ. of Science and Technology (NTNU), Trondheim (Norway)
  3. Maritime Research Inst. Netherlands (MARIN), Wageningen (Netherlands)
  4. Univ. of Rostock (Germany)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office
OSTI Identifier:
1580490
Alternate Identifier(s):
OSTI ID: 1579444
Report Number(s):
NREL/JA-5000-73194
Journal ID: ISSN 0029-8018
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Ocean Engineering
Additional Journal Information:
Journal Volume: 195; Journal Issue: C; Journal ID: ISSN 0029-8018
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; floating offshore wind; uncertainty analysis; OC5; validation; nonlinear wave mechanics

Citation Formats

Robertson, Amy, Bachynski, Erin E., Gueydon, Sebastien, Wendt, Fabian, and Schünemann, Paul. Total experimental uncertainty in hydrodynamic testing of a semisubmersible wind turbine, considering numerical propagation of systematic uncertainty. United States: N. p., 2019. Web. https://doi.org/10.1016/j.oceaneng.2019.106605.
Robertson, Amy, Bachynski, Erin E., Gueydon, Sebastien, Wendt, Fabian, & Schünemann, Paul. Total experimental uncertainty in hydrodynamic testing of a semisubmersible wind turbine, considering numerical propagation of systematic uncertainty. United States. https://doi.org/10.1016/j.oceaneng.2019.106605
Robertson, Amy, Bachynski, Erin E., Gueydon, Sebastien, Wendt, Fabian, and Schünemann, Paul. Sat . "Total experimental uncertainty in hydrodynamic testing of a semisubmersible wind turbine, considering numerical propagation of systematic uncertainty". United States. https://doi.org/10.1016/j.oceaneng.2019.106605. https://www.osti.gov/servlets/purl/1580490.
@article{osti_1580490,
title = {Total experimental uncertainty in hydrodynamic testing of a semisubmersible wind turbine, considering numerical propagation of systematic uncertainty},
author = {Robertson, Amy and Bachynski, Erin E. and Gueydon, Sebastien and Wendt, Fabian and Schünemann, Paul},
abstractNote = {Quantifying the uncertainty in experimental results is a vital step in properly validating numerical simulation tools for designing floating wind turbines; without a good understanding of the experimental uncertainties, it is impossible to confirm if numerical simulation tools can capture the physics with acceptable accuracy. Recent validation studies suggest that the wave-induced, low-frequency surge and pitch motions of semisubmersible-type floating wind turbines are consistently underpredicted by numerical simulations, but it has not been possible to state whether or not this underprediction is within the level of experimental error. Here, previously assessed systematic uncertainty components in hydrodynamic tests of the OC5-DeepCwind semisubmersible are propagated to response metrics of interest using numerical simulation tools, and combined with the system's random uncertainty to obtain the total experimental uncertainty. The uncertainty in the low-frequency response metrics is found to be most sensitive to the system properties (e.g., mooring stiffness and center of gravity), and also the wave elevation. The results of the present study suggest that the underprediction of the low-frequency response behavior observed in previous validation studies is larger than the experimental uncertainty.},
doi = {10.1016/j.oceaneng.2019.106605},
journal = {Ocean Engineering},
number = C,
volume = 195,
place = {United States},
year = {2019},
month = {12}
}